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ALE I. ON NEW AND LITTLE KNOWN COEN INSECTS. 
arranging for this report, our notes of the season on insects 
dus to corn, I have assumed that in the present state of our 
I edge, nothing could be reckoned really insignificant which 
now affected or threatened to affect in future, a crop so im- 
lt as this to the prosperity of the State. The balance of hi¬ 
de in any cultivated region, is so unstable in character, sub- 
d changes dependent upon differences of season and agricul- 
practice, and upon a variety of other causes not well under- 
that it is possible that the most trivial species affecting a 
:may rapidly rise to be one of the most destructive, especially 
>e its normal habit to produce several successive broods in a 
1 . In such an event the importance of accurate knowledge of 
prising species will be readily appreciated, and our acquain- 
I! with the life history of all should be such that we may be 
readily and correctly to divide them into the groups of dan- 
h and indifferent species. Our observations of the year, have 
iquently not been confined exclusively to the major insects in- 
s to corn, but have covered the minor species also, with a 
:o thus laying the foundations for a complete knowledge of the 
;t of insect injuries to this crop in Illinois; and the following 
is to be regarded as preliminary to an elaborate and extensive 
lent of the subject in a future report. 
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